HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Diego

$321+ Cheap flights from Decatur, IL to San Diego (DEC - SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SAN
Jun 1 — Jun 81
Mon 6/1
Mon 6/8
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Decatur to San Diego with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Decatur to San Diego

Cheapest flights from Decatur to San Diego
Explore the most affordable flight options available from Decatur to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 2, 2026.

This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/139:42 am
DEC
-
SAN
1 stop7h 51m
United Airlines
Sun 5/1710:40 pm
SAN
-
DEC
1 stop8h 18m
United Airlines
Deal found 4/27$414
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:42 am
DEC
-
SAN
1 stop7h 20m
United Airlines
Sun 9/610:40 pm
SAN
-
DEC
1 stop8h 06m
United Airlines
Deal found 4/29$444
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/179:37 am
DEC
-
SAN
1 stop7h 50m
United Airlines
Mon 7/206:40 am
SAN
-
DEC
1 stop9h 16m
United Airlines
Deal found 4/27$464
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/149:42 am
DEC
-
SAN
2 stops12h 20m
United Airlines
Mon 5/187:00 am
SAN
-
DEC
1 stop8h 58m
United Airlines
Deal found 4/28$485

Find flight deals from Decatur to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Decatur (DEC) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$414
(United Airlines)

One-way from

$321
(United Airlines)
Provider with most accurate pricing for Decatur Arpt-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Decatur Arpt-San Diego flights.
Search Deals
From Decatur Arpt to San Diego
Search Deals
One-way flight from Decatur Arpt to San Diego
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Decatur to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 2, 2026.
Use the filters below to find and compare flights from Decatur to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Wed 5/13

9:42 am-3:33 pm

1 stop7h 51m

San Diego

Sun 5/17

10:40 pm-8:58 am

1 stop8h 18m

$414
Quickest round-trip

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Wed 9/2

9:42 am-3:02 pm

1 stop7h 20m

San Diego

Sun 9/6

10:40 pm-8:46 am

1 stop8h 06m

$444

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Fri 7/17

9:37 am-3:27 pm

1 stop7h 50m

San Diego

Mon 7/20

6:40 am-5:56 pm

1 stop9h 16m

$464
Cheapest one-way
Quickest one-way

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Tue 8/4

7:20 pm-3:25 pm

1 stop22h 05m

$321

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Sorted by cheapest first
  • Most accurate provider: When it comes to deals on Decatur, Illinois-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Decatur, Illinois-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Decatur, Illinois-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Decatur, Illinois-San Diego flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Decatur, Illinois-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Decatur to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Decatur with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated May 2, 2026.
Read reviews from past customers who have flown United Airlines from Decatur to San Diego. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,680 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.
United Airlines
7.4
Good
9,680 reviews
United Airlines
7.4
Good
9,680 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.

Related info for your journey

Find useful and relevant information for your journey from Decatur to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Decatur, Illinois to San Diego?

    Departing from Decatur, Illinois to San Diego will take you 7h 51m. The distance between Decatur, Illinois and San Diego is about 1643 mi.

  • Can I find deals for flights from Decatur to San Diego that include hotel bookings?

    Yes. In addition to deals on Decatur to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Decatur to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Decatur to San Diego.

  • Can I find deals for business class flights from Decatur to San Diego?

    Yes. Cheapflights offers flight deals from Decatur to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
National City
Coronado
La Mesa
Poway
Julian
Lemon Grove

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Decatur to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Las Vegas flights
O'Hare Intl to Los Angeles flights
O'Hare Intl to San Francisco flights
O'Hare Intl to San Diego flights
Midway to Las Vegas flights
O'Hare Intl to Ontario flights
Midway to Los Angeles flights
St. Louis to Las Vegas flights
O'Hare Intl to Santa Ana flights
O'Hare Intl to Burbank flights
O'Hare Intl to San Jose flights
O'Hare Intl to Reno flights
Midway to San Francisco flights
O'Hare Intl to Sacramento flights
O'Hare Intl to Oakland flights
Midway to San Diego flights
St. Louis to San Francisco flights
St. Louis to Los Angeles flights
O'Hare Intl to Palm Springs flights
Rockford to Las Vegas flights
St. Louis to San Diego flights
Midway to San Jose flights
O'Hare Intl to Santa Barbara flights
O'Hare Intl to Fresno flights
Midway to Reno flights
St. Louis to Ontario flights
St. Louis to Reno flights
Midway to Sacramento flights
St. Louis to San Jose flights
O'Hare Intl to Long Beach flights
Midway to Ontario flights
Midway to Palm Springs flights
Midway to Oakland flights
St. Louis to Oakland flights
St. Louis to Sacramento flights
Moline to Las Vegas flights
O'Hare Intl to Monterey flights
Midway to Fresno flights
Bloomington to Las Vegas flights
St. Louis to Santa Ana flights
Midway to Long Beach flights
Peoria to Las Vegas flights
Moline to San Francisco flights
Moline to Los Angeles flights
Moline to Sacramento flights
St. Louis to Long Beach flights
St. Louis to Burbank flights

Top airline flying from Decatur to San Diego

Discover the top airline that operate flights from Decatur to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$284Average$435FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.